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Drawable和Bitmap转换

一、Bitmap转Drawable

Bitmap bm=xxx; //xxx根据你的情况获取

BitmapDrawable bd=new BitmapDrawable(bm);

因为BtimapDrawable是Drawable的子类,最终直接使用bd对象即可。

二、 Drawable转Bitmap

转成Bitmap对象后,可以将Drawable对象通过Android的SK库存成一个字节输出流,最终还可以保存成为jpg和png的文件。

Drawable d=xxx; //xxx根据自己的情况获取drawable

BitmapDrawable bd = (BitmapDrawable) d;

Bitmap bm = bd.getBitmap();

最终bm就是我们需要的Bitmap对象了。

// 从资源中获取Bitmap

public static Bitmap getBitmapFromResources(Activity act, int resId) {

Resources res = act.getResources();

return BitmapFactory.decodeResource(res, resId);

}

// byte[] → Bitmap

public static Bitmap convertBytes2Bimap(byte[] b) {

if (b.length == 0) {

return null;

}

return BitmapFactory.decodeByteArray(b, 0, b.length);

}

// Bitmap → byte[]

public static byte[] convertBitmap2Bytes(Bitmap bm) {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

bm.compress(Bitmap.CompressFormat.PNG, 100, baos);

return baos.toByteArray();

}

// 1)Drawable → Bitmap

public static Bitmap convertDrawable2BitmapByCanvas(Drawable drawable) {

Bitmap bitmap = Bitmap

.createBitmap(

drawable.getIntrinsicWidth(),

drawable.getIntrinsicHeight(),

drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

: Bitmap.Config.RGB_565);

Canvas canvas = new Canvas(bitmap);

// canvas.setBitmap(bitmap);

drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),

drawable.getIntrinsicHeight());

drawable.draw(canvas);

return bitmap;

}

// 2)Drawable → Bitmap

public static Bitmap convertDrawable2BitmapSimple(Drawable drawable){

BitmapDrawable bd = (BitmapDrawable) drawable;

return bd.getBitmap();

}

// Bitmap → Drawable

public static Drawable convertBitmap2Drawable(Bitmap bitmap) {

BitmapDrawable bd = new BitmapDrawable(bitmap);

// 因为BtimapDrawable是Drawable的子类,最终直接使用bd对象即可。

return bd;

}

via Drawable和Bitmap转换_某源_新浪博客.



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